Application data table for a multiservice digital transmission system

摘要

A method of transmission of application data 97 in a digital transport stream characterised in providing an application data table 110 containing information regarding the applications 97 carried in each service 91, 92 within the transport stream. The application data table 110 may conveniently be designated by a fixed PID value and a TID extension value varying in dependence on the bouquet of services chosen. The use of a single application data table to provide information across all services within a bouquet provides a number of advantages, in particular when deciding whether or not to maintain certain applications when switching between services.